Nitrogen Dioxide(NO2)

The Dyson Air Quality Index

To develop the Dyson Pure Cool™ purifying fan, Dyson reviewed numerous international air quality levels. The particle Dyson AQI levels are based on this research and measured in micrograms per metre cubed. For VOCs and NO2 (plus other oxidising gases) Dyson conducted research in both labs and real homes to calibrate the AQI for actual pollution events seen in homes. The data gathered was used to calibrate the Dyson AQI levels to allow the Dyson Pure Cool™ purifying fan to have the appropriate response level to cover these VOCs and NO2 (plus other oxidising gases).

Good

Your machine is detecting a very low level of microscopic particles and VOCs.

Fair

Your machine is detecting a moderate level of microscopic particles and VOCs.

Poor

Your machine is detecting a high level of potentially harmful microscopic particles and VOCs. You should run your purifier at a medium to high speed or set it to auto mode.

Very poor

Your machine is detecting a very high level of potentially harmful microscopic particles and VOCs. You should run your purifier at a high speed or set it to auto mode.